Nitrogen containing polysaccharide and process for preparing same

Abstract

A novel product comprising nitrogen-containing polysaccharides is produced by bringing a culture product of fungi Basidiomycetes into reaction with an aqueous ammoniacal solution at a temperature of 100 DEG to 250 DEG C. The product is remarkably effective in controlling various plant viruses.

What is claimed is: 
     
       1. A product consisting of nitrogen-containing polysaccharides of the elementary composition of 38-50% of carbon, 2.5-10% of nitrogen, 5.5-7.5% of hydrogen and the balance of oxygen, having a systemic anti-plant viral activity, molecular weights between 500 and 10,000 and a characteristic infrared absorption band at about 1620 cm -1 , obtained by bringing a culture product of a fungus Basidiomycetes into reaction with an aqueous ammoniacal solution of the normality of 0.03 to 17 N, at a temperature of 150°-250° C. under pressure of said aqueous ammoniacal solution at said reaction temperature and by filtering the reaction product then by drying the filtered solution. 
     
     
       2. A product according to claim 1 wherein said culture product of fungus Basidiomycetes is an extraction residue obtained by extracting mycelia or fruit bodies of said fungus Basidiomycetes with an aqueous solvent. 
     
     
       3. A product according to claim 1 or 2 wherein said fungus is the genus Coriolus of Lentinus. 
     
     
       4. A process for producing a product consisting of nitrogen-containing polysaccharides of the elemental composition of 38-50% of carbon, 2.5-10% of nitrogen, 5.5-7.5% of hydrogen and the balance of oxygen, having a molecular weight range of 500-10,000, showing a characteristic infrared absorption band at about 1620 cm -1  and having a systemic anti-plant viral activity by bringing a culture product of a fungus Basidiomycetes into reaction with an aqueous ammoniacal solution of the normality of 0.03 to 17 N, at a temperature of 150°-250° C. under pressure of said aqueous ammoniacal solution at said reaction temperature, then by filtering the reaction product and then purifying the filtrate and drying said purified filtrate. 
     
     
       5. A process according to claim 4 wherein said culture product of fungus Basidiomycetes is an extraction residue obtained by extracting mycelia or fruit bodies of said fungus Basiodiomycetes with water. 
     
     
       6. A process according to claim 4 or 5 wherein said fungus Basidiomycetes is selected from the genus Coriolus and Lentinus.